21世纪的汉语语法研究在理论上要做重新解释,在应用上要区别对外汉语教学和中文信息处理对语法理论和语法知识的不同要求。作为第二语言的汉语语法研究已经有相当多的成果,这种研究和作为母语的汉语语法研究在目的、方法、手段、内容上都有较大的差异。本文从本体论、方法论、认识论、工具论四个角度阐述作为第二语言的汉语语法研究面临的问题。 In the 21st century, the study of Chinese grammar needs to be reinterpreted in theory. In application, different requirements for teaching Chinese as a foreign language and handling Chinese information as grammatical theories and grammatical knowledge should be distinguished. There have been quite a few achievements in the study of Chinese grammar as the second language, and there is a great difference in the research on the Chinese grammar study as the mother tongue in its purpose, method, means and content. This article elaborates on the problems facing Chinese grammar studies as a second language from the perspectives of ontology, methodology, epistemology and instrumentalism.